when set maxheadersize 1, and I request 5 headers.
then response is 
```
{
 "type":Exception Report",
 "message":"More than the maximum allowed number of headers,[1], were detected.",
 "description":"The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request rounting)."
} 
```

In my mind, when out of maximum allowed number of cookies.
We need response the definite response message to tell developer or user, how to fix the client error.